March is hot. April is hotter, however Pi Mai does occur around the middle of April. From whom did you hear about the smoke? What areas were mentioned? There is no smoke in April and not much in March. The last few years have been fine.
You posted this on other sites as well. Your answers will always be the same.

I refered you to a bunch of my posts on Thorn Tree but here's the lowdown anyway. Burning of farmlands and hills in the far north hilly region to prepare for planting takes place in January-March and it can get uncomfortable in March when the heat also maxes out. It depends a lot on wrong place wrong time if a big burn is underway closeby, so it can just be a little hazy or downright choking depending on where you are at the time. April can be statistically hotter but it usually brings the first decent rains of the year which clear the air significantly. So on that basis (and because of the festival mid-month) I would recommend April instead of March. It will be hot but hopefully will rain a bit too and cool/clear the air (or you just throw water on each other for Pi Mai).

#4Captain_Bob has been a member since 27/5/2006. Location: Thailand. Posts: 1,918

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